I haven't sampled all these threads. DeWayne Walker is another undervalued defensive coach, IMO, along with Clancy Pendergast, who I mentioned a few weeks ago. Supposedly Pendergast has been offered the USC defensive coordinator position by Clay Helton but hasn't made up his mind due to the uncertainty of the 49ers coaching staff. That was the variable I mentioned a few weeks ago in regard to Pendergast.
I follow Pac 12 football closely since I went to school out there and then lived in Las Vegas for 25 years. DeWayne Walker was an effective defensive coordinator for UCLA about a decade ago and then campaigned for the head coaching job. He didn't get it and got frustrated, to the point he got desperate and took the top job at a no-chance program like New Mexico State. He quit that job despite a contract extension and is now an assistant with the Jaguars. It wouldn't be unlikely that he'd return to the college ranks for a high profile defensive coordinator role now that he's gotten the head coaching itch out of the way.
Those UCLA defenses were surprisingly aggressive in Walker's tenure. In fact, UCLA in 2006 upset USC as 13 point home underdog to deny USC a national championship berth as the Bruins battered the USC running game throughout the game, one season after USC rambled for something like 400+ yards on the ground a year earlier, before Walker got the job.
Anyway, just a name I thought I would throw out there, someone who isn't obvious. Pendergast probably wants to remain on the West Coast but with Walker already in Jacksonville the regional aspect shouldn't be an issue.